<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Title</title>
  <link rel="stylesheet" href="csstest.css">
</head>
<body>
<div class="div1">
<button class="btn01" value="value">按钮</button>
<br>

<p>css测试<input class="input1" type="text"></p>
</div>
</body>
</html>